O18

O18 or O-18 may refer to:

Airports

 * Hanford Municipal Airport, in California, United States; formerly assigned FAA LID
 * Buzzards Roost Airport (FAA LID ), Inola, Oklahoma, USA; see List of airports in Oklahoma

Rail stations

 * Tondabayashi Station (station code ), Tondabayashi, Osaka Prefecture, Japan
 * Xinzhuang metro station (station code ), Xinzhuang District, New Taipei, Taiwan

Literature

 * Naos (hieroglyph) (Gardiner code ), an Egyptian hieroglyphic representing a shrine
 * Minuscule 442 (Soden code ), a Greek New Testament minuscule manuscript
 * Minuscule 441 (Soden code ), a Greek New Testament minuscule manuscript

Other uses

 * Curtiss O-18 Falcon, an observation aircraft of the United States Army Air Corps
 * Oxygen-18, an isotope of oxygen
 * Delta-O-18, a measure of the ratio of stable isotopes 18O:16O (oxygen-18:oxygen-16)
 * MSC(O)-18, minesweeper built for the United States Navy during World War II
 * over age 18 (O18), an age grouping, such as found in sports